504 
Proceedings of Royal Society of Edinburgh. [sess. 
C. barbadensis. Grev., Trans. Micr. Soc. Land ., 1861, p. 43, 
pi. iv. fig. 9. — Diam. *035 mm. Surface fiat. Central space absent. 
Markings polygonal, 8 in *01 mm., 9 subsymmetrical prominent 
rows proceeding from the centre to the border, the intervening rows 
subradial. 
This species, like G. senarius , Sch. (. Atl. , pi. lvii. fig. 24), 
forms the transition to AulacoUiscus. In the second edition of 
Habirshaw’s Catalogue, the unnamed Springfield valves figured by 
Schmidt (. Atl ., pi. lvii. fig. 32), subsequently justly separated by 
Grunow as C. semipennatus ( Denk . Wien. Ak., 1884, p. 83), are 
erroneously associated with this species. 
Habitat. — Barbados deposit (Greville !). 
C. Gregorii. O’Me., Proc. Roy. Ir. Acad., 1875, p. 263, pi. xxvi. 
fig. 23. — Central space small, angular. Markings subquadrangular, 
smaller and more equal than in C. nitidus, Greg.; rows radial from 
the angles of the central space, fasciculate ; those in each fasciculus 
parallel to that at its centre or subradial. 
This is not Carnpylo discus ? an C oscinodiscus ? Greg., from Glen- 
shira Sand (Trans. Micr. Soc. Lond., 1857, p. 84, pi. i. fig. 50), as 
stated by O’Meara, Gregory’s specimens being devoid of a central 
space, and having large rounded sparsely placed markings in rows 
partly parallel and partly radial, among the rows a broad rectangular 
cross being faintly visible. 
The C. semipennatus , Grun. (Sch., Atl., pi. lvii. figs. 32, 32*), from 
Barbados, is not so close to C. Gregorii, O’Me., as it is to Gregory’s 
valves. C. Gregorii differs from C. senarius , Sch., in the presence 
of a central space, and in having less evident rays between the 
fasciculi. 
Habitat. — Arran Island; Ascidia, Roundstone Bay, co. Galway; 
Ascidia, co. Clare (O’Meara). 
C. denarius. Sch., Atl., pi. lvii. figs. 19, 20, 21. — Diam. ’053 to 
*0755 mm. Central space absent. Markings polygonal, equal, 3|- 
to 4 in *01 mm., rows fasciculate, those of each fasciculus parallel 
to the radial row at its centre, secondary straight oblique decussating 
rows obvious. Border strise sometimes distinct, 8 in *01 mm. — C. 
* In the collection of Dr Griffin, and procured in the original sample sent 
to Firth by Kitton. 
